Combating COVID-19: UV-C Air Sanitation Eliminates Airborne Pathogens

Healthy Indoor Air Crucial During Pandemic

Sponsored From Siemens

The air we breathe indoors can quickly become dangerous if COVID-19 pathogens are present. While wearing face masks and keeping your distance can help fend off the larger COVID-19 droplets in indoor air, they do little to protect you from the suspended aerosols that we now know are more insidious. Since we spend up to 90% of our time inside, staying healthy starts with healthy indoor air.

Fresh air circulation is the traditional method for achieving healthy air. But attaining the proper air exchange for good indoor air quality (IAQ) can be easier said than done. Depending on the number of people in a room, the required rate of complete air exchange can vary from once an hour to once every 5 minutes or less. Today, IAQ leaders Keyter and Siemens are partnering on another proven method that has been refined to meet today’s needs: sanitizing the air with Ultraviolet-C to render the pathogens harmless.

AirSanit Units Driven by Climatix Controllers

In the early days of the pandemic, Keyter began developing its new AirSanit air handling, purification and sanitizing units that use UV-C to deactivate and eliminate COVID-19 and other airborne pathogens. Keyter employs Siemens Climatix controllers to drive the AirSanit mobile unit and the AirSanit PRO fixed installation.

“We selected Siemens Climatix controllers because they meet AirSanit needs for absolute control of air-flow and air-speed in a simple way that can be adapted quickly to the application requirements. Siemens Climatix 400 is designed specifically for plug-and-play units like AirSanit MOBILE, while Siemens Climatix 600 makes running the larger AirSanit PRO exact and efficient,” said Aurelio García, AirSanit project leader, Keyter.


People and Animals Can Be PresentAirsanit 216x216

The beauty of the state-of-the-art AirSanit units is that they are the only air treatment and purification systems that can be run while people and animals are in the room. They use a sanitizing process that combines an air filtration system with UV treatment to deactivate and eliminate pathogens in the unit. The disabled pathogen elements are retained in a filter in the unit, which then supplies healthy air that minimizes contagion risk. The Siemens Climatix controller adapts the air-flow to the room size and number of occupants. To protect the person who changes the filter, the system is put into a “detox mode” that uses thermal shock to kill any possible pathogens that might be stuck to the filter.

Effective Modular Design

The technology design is straightforward and modular. The polluted air passes through a stage 1 filter before it enters the detoxification system in stage 2. The detox system consists of a high-temperature shock treatment, which takes place once a day in a one-hour cycle at 56° C in laminar air-flow of 0,2m/s. The air undergoes UV-C radiation in stage 3. The germicidal effect of the UV-C radiation destroys the DNA of the bacteria, viruses and other pathogens so they can’t grow and proliferate. In essence, the microorganism absorbs a UV photon that destroys the link in its DNA chain, inhibiting the microorganism’s replication. In stage 4, the air then passes through a HEPA filter, which retains the deactivated pathogens, as clean air supply. The filtering efficiency of the HEPA filters is high: more than 99.95% for H13 filters and more than 99.995% for H14 filters.

“Siemens has long been committed to providing perfect indoor air quality, which is even more important during the pandemic. Partnering with Keyter on their leading-edge AirSanit air purification systems continues this tradition,” said Jaume Martin Paz, HVAC OEM channel Head, Siemens Spain.

AirSanit was tested and certified by the INTA Nuclear, Biological and Chemical Threats Lab at the Ministry of Defense of Spain. According to the tests, the AirSanit air purification system achieves a 100% reduction of the MS2 viral load in air outtake versus the viral load in the air intake, from time zero after spray. The filters last one to two years depending on the pollution of the air. The UVC lamps have a lifespan of 10,000 hours, approximately three to four years.

Widespread Use

AirSanit units can be easily integrated into new or existing buildings and new or existing HVAC systems. The Climatix controllers manage the unit, adjusting purification capacity, flow and time programming. The controllers also manage the real-time monitoring system that uses specific sensors to measure the essential parameters that control IAQ and unit constants. These parameters, including HEPA filter clog levels, particles volume, pollutant particles and carbon dioxide, can be checked on the 7-inch touch panels on the units. The Climatix controllers also provide remote monitoring that can be run with WiFi and 3/G connectivity.

The AirSanit units are finding a place in the full spectrum of building types. Health care and education uses include hospitals and health centers, clinics, senior residences, laboratories, research facilities, pharmaceutical manufacturing, universities and schools. Public-use facilities include corporate buildings and offices, stores and shops, malls, airports and boarding bridges, sports centers and arenas, residential, hotels and restaurants.

Strong Line of Defense

AirSanit purification units driven by Climatix controllers combine in a single system different effective technologies that reduce and eliminate PM1 such as viruses, bacteria, microorganisms or pathogens in addition to other particles such as dust and pollen. Together, AirSanit and Climatix present a strong line of defense against COVID-19.

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